Tyrannosaurus rex was one of the most ferocious ... this famous carnivore dominated the forested river valleys in western North America during the late Cretaceous period, 68 million years ago.

Tyrannosaurus rex, long thought to be the biggest carnivorous dinosaur, lived in North America during the twilight ... or ...

Scientists have uncovered an apex predator that once ruled the prehistoric world, eclipsing early relatives of the ...